General > General Technical Chat
3 DMMs - spot the difference ;)
patb:
Hi guys,
I am not an expert in DMMs, but I spotted very similar DMMs from different manufaturers (see attached images). Am I correct that all 3 below multimeters are actually the same construction inside?
Extech MM-560 (http://www.extech.com/instruments/product.asp?catid=48&prodid=283)
Amprobe AM-140 TRMS (http://amprobe.com/cgi-bin/pdc/viewprod.cgi?pid=1913&tid=1&type=elec)
Brymen BM-857a (http://brymen.com/product-html/cata850a/Bm850as.htm)
Amprobe has a little bit different specs, but... I don't know. It looks the same. I didn't check prices, but I know that Brymen is cheaper than for instance Extech (in Poland at least).
EDIT: It seems that Amprobe AM-140 TRMS is obsolete now. Current version is AM-140-A, which looks very similar but is black/red.
Bored@Work:
Welcome to the wonderful world of rebranding, also known as badge-engineering, also known as OEM, ODM, VAR.
ivan747:
The Extech image seems to be retouched :-\
patb:
--- Quote from: BoredAtWork on July 21, 2011, 07:51:49 pm ---Welcome to the wonderful world of rebranding, also known as badge-engineering, also known as OEM, ODM, VAR.
--- End quote ---
Yay! :)
IanB:
It might be that they use the same core DMM chip inside, hence the similar buttons and range switches, but it is still possible that they have different mechanical and electrical construction inside the case. Only by taking them apart and examining the circuit boards could you tell.
Since such a meter is more likely to be used as a "lab" meter than an "industrial" meter, the ruggedness and input protection might not matter so much as the accuracy, repeatability and stability over time. Which you still can't tell from looking at them...
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